Design of 3WAY VRF SYSTEM
2
- 53
1
2
3
4
5
6
7
8
7. Optional Parts
NOTE
Nut (field supplied) (3/8" or M10)
Suspension bolt (3/8" or M10) (field supplied)
Washer
Never use a long screw
other than the accessory screw.
This may bore a hole through
the tube surface, causing
refrigerant leakage.
M4 screw (M4 × 15/32")
M4 screw (M4 × 15/32" : supplied )
How to use the fittings
Suspension hook
4. Wiring, Tubing, and Heat Insulation
1. Refrigerant tubing
2. Heat Insulation
Gas tube
Liquid tube
Suction tube
Liquid tube
Discharge tube
Cool with damp cloth or other means when brazing the joint with a torch.
Otherwise, the solenoid valve will be damaged.
When brazing, be sure to perform nitrogen replacement inside the tube so that oxidation coating does not form
inside the tube. Then stop performing when nitrogen replacement is completed. The solenoid valve, however,
will be damaged if nitrogen is applied during while brazing.
Heat sensitive components, protect from flame and heat conduction.
Comply with all Local Code Requirements.
Clean base metals throughly.
Use proper ventilation to carry fumes away from the work area.
Use a high quality silver based solder of at least 15% silver.
Heat the base materials broadly and uniformly.
Take precautions not to overheat the device which could damage sensitive internal components.
Insure compliance with all local codes!
Be sure to insulate the tubing after finishing leakage inspection.
Wrap insulators (field supplied) having a thickness of 25/64" or more with the heat resistance of 248 or more
around the discharge tubes and gas tubes, and 176 or more around the suction tubes and liquid tubes.
Wrap around the each tube not to make gaps between the thermal insulation.
Failure to conduct shielding gaps and thermal insulation will cause water leakage.
Install the hanging hook with supplied 4 screws (M4 X 15/32") taking care of the positioning.
Wrong positioning will become unfitted center of gravity position,
causing injuries or product damage.
CAUTION
TD831158-00̲3WAY̲VRF̲SYS.indb 53
TD831158-00̲3WAY̲VRF̲SYS.indb 53
2012/01/23 17:30:22
2012/01/23 17:30:22
Summary of Contents for U-72MF1U9
Page 118: ...Section 8 TENTATIVE ...